Identification

Description

Frustules are lightly silicified. In girdle view, valves are sigmoid and narrow. Girdle bands are absent. Valves are lanceolate to rhomboid with sharp apices. Striae are not resolvable with light microscopy. The fibulae are irregularly spaced and number 8-11 in 10 µm. Fibulae, however, are not widely spaced at the central part of the valve.

Links

Cite This Page

Manoylov, K. (2011).
Nitzschia sociabilis.
In Diatoms of North America.
Retrieved June 07, 2020, from https://diatoms.org/species/nitzschia_sociabilis

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Nitzschia sociabilis from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)STRAHLER = distribution plot of the Strahler Stream Order SLOPE = stream reach gradient (degrees)W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.PHSTVL = pH measured in a sealed syringe sample (pH units)log_COND = log concentration of specific conductivity (µS/cm)log_PTL = log concentration of total phosphorus (µg/L)log_NO3 = log concentration of nitrate (µeq/L)log_DOC = log concentration of dissolved organic carbon (mg/L)log_SIO2 = log concentration of silicon (mg/L)log_NA = log concentration of sodium (µeq/L)log_HCO3 = log concentration of the bicarbonate ion (µeq/L)EMBED = percent of the stream substrate that is embedded by sand and fine sedimentlog_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.

Nitzschia sociabilis

Hust. 1957

Apices nearly apiculate

Fibulae distinct, irregularly spaced

Frustules sigmoid (in girdle view)

Longitudinal line appears to connect fibulae

Frustules are lightly silicified and sigmoid in girdle view. Valves are rhomboid-lanceolate and have sharp apices. Striae are not resolvable in LM. Fibulae are irregularly spaced. A gap between fibulae is absent in the central valve. A longitudinal line appears to connect fibulae.